Since 1997, Sergio Marchisio is full professor of international law at the Sapienza University of Rome. He started his academic career in the Seventies as assistant professor and chargé de cours of international law at the Universities of Florence and Camerino. In 1979, following a concourse at the national level, he gained the title of full professor and was called firstly at the University of Camerino and then at the University of Perugia, until his appointment at the University Sapienza of Rome in 1997. He is Director of the 2nd Level Master Course in International Protection of Human Rights and of the Training Course on Refugees and Migrants. Member of the Scientific Board of the PhD in “Public, Comparative and International Law” and Member of the Academic Board of the Sapienza School for Advanced Studies. His main scientific interests are, among others, the formation of general international law, the law of international organisations, international environmental law, human rights and disarmament, space law, development cooperation law.
Author of around 200 publications, among which: "Diritto ambientale. Profili internazionali, europei, comparati, Torino, 2017”; “Disarmo, limitazione degli armamenti e diritti umani”, Napoli, 2016; “Corso di diritto internazionale”, Torino, 2014; “L’ONU. Il diritto delle Nazioni Unite”, Bologna 2012; “ “Rio 1992. Vertice per la Terra”, Milano, 1993; “Le basi militari nel diritto internazionale”, Milano, 1984; "La cooperazione per lo sviluppo nel diritto delle Nazioni Unite", Napoli, 1977. In 2016, he was called at the Hague Academy of International Law to give a special course on "Les activités spatiales internationales entre droit public et droit privé". Member of the Editorial Board of “I diritti dell’uomo. Cronache e battaglie”, “Ordine internazionale e diritti umani”, “The Aviation and Space Journal” and “Chinese Society of Astronautics Journal”.
Founder and Former Director of the Institute for International Legal Studies of the National Research Council (1995-2011), he is now Associate Professor to the Institute. During ten years, he supervised and edited the research on the "Italian Practice of International Law", published in 1995 by the CNR (I-VIII volumes). Member of the Board of Directors of the Italian Society for International Organization and Member of the Italian Human Rights Committee. Member of the Scientific Committee of the Italian Council for Refugees (CIR); Correspondent Member of the International Institute for the Unification of Private Law (UNIDROIT); Italian Correspondent of the TMC Asser Institute, The Hague. During ten years (2001-2011), he acted as Secretary General of the Italian Society of International Law (SIDI). From 1995 to 2015, he was also adjunct professor of European Union Law at Faculty of Law of the LUISS G. Carli University.
He is an internationally recognized expert on space law, field that he covered with several publications, starting from "Lezioni di diritto aerospaziale" in 2000. Co-Director of the Master Course in Space Policy and Institutions, organized by the CNR, the Italian Society for International Organization (SIOI) and the Italian Space Agency (ASI). Member of the Scientific Committee of the Master IDEST "Droit des telecommunications et des nouvelles technologies" of Paris Saclay, Faculté de droit Jean Monnet. He is Member of the Board of Directors of the International Institute for Space law (IISL), confirmed in September 2016. Full Member of the International Academy of Astronautics (IAA). Member of the Académie de l’air et l’espace (ANAE), the London Institute of Space Policy and Law, and the Chinese Academy of Astronautics. Since 2015, he is member of The Hague Space Resources Governance Working Group.
In 2011, he received the Award IAA for Social Sciences for his contribution on space law. In 2015, he received the IISL Distinguished Service Award for his leadership in the development of international law and institutions and his leading role for advancing international space law in the United Nations and other intergovernmental bodies. Since 2007 he is Chairman of the European Centre for Space Law (ECSL) within the European Space Agency (ESA). Since 2017 is Member of the Advisory Council of the European Space Policy Institute (ESPI).
Beside his scientific achievements, he also carried out a number of functions as Legal Advisor at the Italian Ministry of Foreign Affairs and International Cooperation. Italian Delegate to many international diplomatic conferences, such as the United Nations Conference on Environment and Development (Rio de Janeiro, 1992); the United Nations Diplomatic Conference of Plenipotentiaries on the Establishment of an International Criminal Court (Rome, 1998); the Diplomatic Conference to Adopt a Mobile Equipment Convention and an Aircraft Protocol (Cape Town, 2001).
Since 1997, he is Italian Delegate to the UN Committee on the peaceful uses of outer space (COPUOS, Vienna), where he served as Chairman of the Legal Subcommittee (2004-2006). In 2010, he was elected co-chair of the Expert Group D of the Working Group of the COPUOS Scientific and Technical Subcommittee (STSC) on the Long term Sustainability of the Outer Space Activities (LTSSA). Italian Delegate to the European Union Council's committes on space and disarmament, he was member of the task force of the EEAS-EU for the International Draft International Code of Conduct on Space Activities (ICoC). In 2015, he was appointed by the EU High Representative for Foreign Affairs and Security Policy as chair of the multilateral negotiations on an ICoC held at the United Nations in New York. In 2012, he was appointed by the UN Secretary General member of the Group of Governmental Experts (GGE) on Outer Space Transparency and Confidence-Building Measures established by UN General Assembly resolution 65/68. Between 2001 and 2012, he chaired the Committee of Governmental Experts entrusted to negotiate the UNIDROIT Space Assets Protocol to the Cape Town Convention on International Interests in Mobile Equipment. In 2012, he was elected Chair of the Commission of the Whole of the Berlin Diplomatic Conference, which adopted the Protocol. He is member of the Specialized Panel of Arbitrators of the Permanent Court of Arbitration established pursuant to the Optional Rules for Arbitrations of disputes dealing with spacer matters.
In 2009, he was appointed by the Ministry of Foreign Affairs and the Ministry of Education, University and Research (MIUR) as member of the Task-Force for setting up the Italian Register of the Objects launched in Outer Space. Since 2014, he is Member of the Board of Directors of the Italian Space Agency.